@misc{indiciaef83376d20a2a,
  title = {Aeromagnetic map of the Fort Wilkins quadrangle, Keweenaw County, Michigan},
  author = {James R. Balsley and J. L. Meuschke and Jean Blanchett},
  year = {1963},
  doi = {10.3133/gp317},
  url = {https://pubs.usgs.gov/publication/gp317},
  note = {Source identifier: gp317}
}